netdev - Re: [Cbe-oss-dev] [PATCH 4/10] spidernet: zero out a pointer.

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Message-Id: <de086868a64685afb768ecd78423a14f@kernel.crashing.org>
Date:	Wed, 23 May 2007 02:29:52 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	linas@...tin.ibm.com (Linas Vepstas)
Cc:	Jeff Garzik <jgarzik@...ox.com>, cbe-oss-dev@...abs.org,
	Michael Ellerman <michael@...erman.id.au>,
	netdev@...r.kernel.org
Subject: Re: [Cbe-oss-dev] [PATCH 4/10] spidernet: zero out a pointer.

>> If you're going to be paranoid, shouldn't you do something here to 
>> make
>> sure the value's hit the device?
>
> I thought the whole point of paranoia is that its inexplicable.
>
> Here's a delusional reply: I didn't see any point to it.
> 1) a wmb would add overhead

A wmb() doesn't guarantee the write has reached the device.

> 2) the hardware is supposed to be looking at the status flag,
>    anyway, and not misbehaving.

But you're paranoid, right?  Can't trust that device! :-)


Segher

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